where \(\Pi _{{\perp \perp }}^{0}(z)\)  and \(\Pi _{{\parallel \perp }}^{0}(z)\)  correspond to massless,
purely perturbative contributions,
which are known to two- and three-loop accuracy from Refs. [1]} and [2]},
respectively. The new contribution of this work is the calculation of the CFs
\({m^2}^{{\perp \perp }}\) , \({m^4,\mathrm {di}}^{{\perp \perp }}\) , \({m^4,\mathrm {nd}}^{{\perp \perp }}\) , \(C_{2}^{{\perp \perp }}\) , \(C_{1}^{{\perp \perp }}\) ,
\({m^2}^{{\parallel \perp }}\) , \({m^4,\mathrm {di}}^{{\parallel \perp }}\) , \({m^4,\mathrm {nd}}^{{\parallel \perp }}\) , \(C_{2}^{{\parallel \perp }}\) , \(C_{1}^{{\parallel \perp }}\) ,
and the ADs \(\gamma _{\perp \perp }\) , \(\gamma _{\parallel \perp }\)  to three-loop accuracy.
